Physics motion problem with solution if acceleration,retardation & constant speed given.

Q) A train starts from rest & accelerates uniformly at a rate of 2m/s^2 for 10 s. It then maintains a constant speed for 200s.The brakes are then applied and train is uniformly retarded and comes to rest in 50s.Find (1) the max. velocity reached. (2) the retardation in last 50s. (3) the total distance travelled, and (4) the average velocity of the train.